A study on efficient location oriented PN code allocation in multi-code sense CDMA at an intersection

Yusuke Takahashi, Kohei Ohno, Makoto Itami

Research output: Contribution to conferencePaper

Abstract

In this paper, the system of inter-vehicle and road-vehicle communications is studied in order to make traffic flow in intersections smooth and to provide assistance for safety driving there. This system adopts MCS-DS/CDMA(Multi Code Sense - Direct Sequence/Code Division Multiple Access) scheme that uses the PN(Pseudo Noise) code allocated on the road. Currently, the schemes based on CSMA/CA(Code Sense Multiple Access/Collision Avoidance) is widely being researched and developed for inter-vehicle communication. However, the system based on CSMA/CA has the problem so called 'hidden terminal problem' and this makes the communication performance degrade under crowded traffic situations. On the other hand, it is possible to allocate PN codes so that equivalent PN codes are not be received in any location. Even if the signals that are using different PN codes are simultaneously received, it is possible to make communication in MCS-DS/CDMA scheme. Therefore, it is expected that 'hidden terminal problem' can be improved in the proposed system. In this paper, traffic flows around a T-shaped intersection is simulated using a traffic simulator and the communication characteristics of the proposed system is evaluated. The performance of the proposed system is compared with that of the MCS-DS/CDMA system that allocates PN codes randomly. As the result of simulation, the proposed MCS-DS/CDMA system with location oriented PN code allocation can improve 'hidden terminal problem' in MCS and communication performance.

Original languageEnglish
Publication statusPublished - 1 Jan 2010
Event17th World Congress on Intelligent Transport Systems, ITS 2010 - Busan, Korea, Republic of
Duration: 25 Oct 201029 Oct 2010

Conference

Conference17th World Congress on Intelligent Transport Systems, ITS 2010
CountryKorea, Republic of
CityBusan
Period25/10/1029/10/10

    Fingerprint

Cite this

Takahashi, Y., Ohno, K., & Itami, M. (2010). A study on efficient location oriented PN code allocation in multi-code sense CDMA at an intersection. Paper presented at 17th World Congress on Intelligent Transport Systems, ITS 2010, Busan, Korea, Republic of.